SCExAO is a HCI system installed on the infrared Nasmyth platform at the Subaru telescope behind the facility adaptive optics, AO188[1]} that performs a first level of atmospheric turbulence correction. Typical Strehl ratios are 20 to 40% after the correction using the AO188. In addition, the SCExAO provides the second level of correction using a 2,000-actuator DM and a visible Pyramid WFS (PyWFS) and allowing to obtain a high Strehl ration(\(\approx \)  90% with good seeing in NIR)[2]}, [3]}. Figure REF  shows the effect of the first level correction by AO188, and the ExAO correction by SCExAO. With the SCExAO correction, the speckle halo around the point spread function (PSF) is more stable, and at a lower level, allowing for better sensitivity when looking for companions and disk near host stars.
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